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Is it bad to keep on unplugging and replugging in my Sony TV while it's on?
This thread has 6 replies. Displaying all posts.
Post 1 made on Wednesday July 28, 2004 at 15:00
scott1598
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I do this because my tv is on a swivel and sits on a cabinet above my entertainment system (The TV is a 27" Sony Flat screen Trinitron). When I swivel it to the direction I am facing it picks up this weird discoloration in the corners from magnetism or something like that. I know this because I asked about it once in a forum like this and was told. I was also told that this is somewhat normal. Is that true?

Therefore, I must unplu the set while it is on and have ot off for a few seconds and replug it in. This does something to reset and basically wipes away the discoloration. But, I swivel my tv constantly and it always happens thus the same process over and over.

Anyone ever come across this and have done similar? And basically, over the life of the TV is this harmful to do? It would seem to me that it would. Please let me know any and all thoughts and if there is something less harmful I can do. Thanks in advance.
Post 2 made on Wednesday July 28, 2004 at 17:49
SamG
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I've never really done that a lot over a period of time to any piece of equipment, but I don't think you'd have a problem. Also, you should only have to turn the tv off then on, not necessarily unplug it.

However, the bigger question is what's causing the color shift? You're right, it is from a magnetic influence. Turning the TV off then on will "degaus" (sp?) it to get rid of the funking colors.

When you swivel the TV, does the side with the bad color end up near a speaker? A strong magnet? I'd try to remove the offending item instead of constantly turning the TV off and on.

Post 3 made on Wednesday July 28, 2004 at 22:48
teknobeam1
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When you unplug you TV, it must have an "auto de guasing" system. Deguasing basically removes spurious magnet energy by using a very strong electromagnet to lift it from the area. when you erase a cassette tape you are de guasing it. You need to move the magnetic source away from the TV set permanently
Post 4 made on Thursday July 29, 2004 at 09:49
Ernie Bornn-Gilman
Yes, That Ernie!
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Can you pull it out and swivel it, and then turn it on? That sounds like it might solve, or at least minimize, your problem.

Believe it or not, this is completely typical in sets over about 30", and is a result of the magnetic field of the earth, with a strength of about a half gauss (the magnetic field in a tweeter can be several thousand gauss), modifying the path that electrons travel in the TV tube. The bigger the tube, the more the earth's field can influence the (longer) travel.

When you turn the TV on, an internal degausser demagnetizes the tube (if it is not too magnetized). This makes it perform with no color problems as long as you do not rotate it. I am not sure just what part of the tube gets demagnetized, but the key is to turn it on after rotating it so that the tube is degaussed in its final orientation.

This problem is a bit unusual in a 27" TV, though, unless there is a speaker or something else nearby, where its magnetic field influences the picture tube.


I would hate to be turning a TV on and off like that. I guess it might be okay, but every turn-on does stress parts in the power supply (at least), and while those parts are made to put up with the stress of going off and on and being used, maybe you will overdo what can reasonably be expected of them. Carpal tunnel syndrome, for intance, is the result of using the hands and arms in a completely acceptable way, but too much with too little variation. This metaphor falls down with regard to variation, as you really can't turn the TV on or off differently to relieve stress, but otherwise, well, I wouldn't do it if I could avoid it.

Pull it out, then turn it on.

We can't give you a good answer, or maybe any, without the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 5 made on Thursday July 29, 2004 at 19:25
Larry Fine
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On 07/29/04 09:49, Ernie Bornn-Gilman said...
I am not sure
just what part of the tube gets demagnetized...

It's the shadow mask, which is just behind the CRT face, and is what makes sure the electrons hit individual phosphor "dots", sort of like a spray-paint stencil.

By being magnetized, the shadow mask can alter the path of the electrons (improper deflection), and results in the typical color variations as the wrong dots are illuminated.

It's made of steel, which is ferrous. It's even possible to overheat a shadow mask to the point of glowing red-hot and/or warping, and obviously can ruin a CRT.

This problem is a bit unusual in a 27" TV, though,
unless there is a speaker or something else nearby,
where its magnetic field influences the picture
tube.

Another possibility is any nearby electronics with a transformer and/or motor, both of which produce quite strong magnetic fields. Try moving the TV while other components are unplugged, not just switched off.

Larry
www.fineelectricco.com
Post 6 made on Sunday August 1, 2004 at 00:47
Ernie Bornn-Gilman
Yes, That Ernie!
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On 07/29/04 19:25, Larry Fine said...
Another possibility is any nearby electronics
with a transformer and/or motor, both of which
produce quite strong magnetic fields. Try moving
the TV while other components are unplugged, not
just switched off.

I would think that a transformer would cause moving variations in the colors, because NTSC is not exactly 60 Hz. But do some of the other formats use a line-synced refresh rate? If they are not synced to the power line, the colors would shift, and he probably would have mentioned that. I am sure that moving colors shifts would freak out anybody more than static color shifts.
We can't give you a good answer, or maybe any, without the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 7 made on Monday August 9, 2004 at 19:51
JGarth
Long Time Member
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most sony's have a auto de guasing" system, on some models it makes a big "BONK" sound when you turn on the TV. To answer the most important part of your question, I think it is a very bad idea to turn off and on any TV too often but on sony's it is especialy risky, I have seen many Dead Sony TV's and almost all of them died because the Power board failed! I think over taxing the power board with on/off cycling is very risky.


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